Flat Rock, IL: 4 Violations — 66/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
If you're checking Flat Rock, IL tap water safety, the short answer is: average — violations are present in parts of the city and specifics depend on which water system serves your address.
How Flat Rock Compares
Data: EPA SDWIS Last verified: 2026-06-03
Flat Rock Water: The Quick Version
- Your city's water systems recorded 4 violations in the past 5 years.
- Homes built before 1986: 63% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 14.09 — above typical levels.
Water Systems Serving Flat Rock
Federal records track 1 water system in Flat Rock, IL, and a single provider handles the dominant share of residential connections while carrying primary responsibility for EPA compliance.
Overview
We track water quality and home safety data for 1 ZIP code in Flat Rock, Illinois, covering 1 community water system serving approximately 1,905 people.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Flat Rock: C (66/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Flat Rock water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Flat Rock
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | 6 | 1 |
| Stage 2 DBP Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 62427 | C | 4 | 0 | Flat Rock |
All ZIP Codes in Flat Rock
- 62427 [C] — 4 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Flat Rock
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Flat Rock
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Flat Rock's Housing Stock?
With 63% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The median home in Flat Rock was built in 1975 — a figure that places most of the city's residential stock in the era when lead solder was still standard in copper plumbing. Homes built before 1986 may have lead-soldered joints; those built before 1970 face the additional possibility of lead pipes in the service line itself.
Over half of homes in Flat Rock were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Flat Rock: Remediation Cost in Perspective
At current valuations, Flat Rock sits in the low remediation-share tier — the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Flat Rock are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 43% below the Illinois average.
Protecting Children from Lead in Flat Rock
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Despite citywide averages serving as the standard public reference point, those aggregates cannot resolve what is happening at one specific faucet — and where 63% of Flat Rock homes come from before the solder rule or where utility samples sit at or above the action mark, the gap between system data and faucet reality matters more than it does in lower-exposure communities. An in-home draw closes that gap, with certified filtration through retailer networks available where confirmed faucet results warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Flat Rock
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Surface Water Treatment Rule can reduce the most common contaminant found in Flat Rock's water.
- Check your home's plumbing. With 63% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Flat Rock, IL